X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=include%2Flinux%2Fpercpu_counter.h;h=9007ccdfc1127cfe73db03e31dd82a843f8f4fa8;hb=b04cde34cf1d006dfaf8523640f3a18bbb15ebaa;hp=f5aa593ccf32fe358da38271e4a25d0653cfd8a0;hpb=ae3e0218621db0590163b2d5c424ef1f340e3cc6;p=linux-2.6-omap-h63xx.git

diff --git a/include/linux/percpu_counter.h b/include/linux/percpu_counter.h
index f5aa593ccf3..9007ccdfc11 100644
--- a/include/linux/percpu_counter.h
+++ b/include/linux/percpu_counter.h
@@ -8,6 +8,7 @@
 
 #include <linux/spinlock.h>
 #include <linux/smp.h>
+#include <linux/list.h>
 #include <linux/threads.h>
 #include <linux/percpu.h>
 #include <linux/types.h>
@@ -17,6 +18,9 @@
 struct percpu_counter {
 	spinlock_t lock;
 	s64 count;
+#ifdef CONFIG_HOTPLUG_CPU
+	struct list_head list;	/* All percpu_counters are on a list */
+#endif
 	s32 *counters;
 };
 
@@ -26,20 +30,28 @@ struct percpu_counter {
 #define FBC_BATCH	(NR_CPUS*4)
 #endif
 
-static inline void percpu_counter_init(struct percpu_counter *fbc, s64 amount)
+int percpu_counter_init(struct percpu_counter *fbc, s64 amount);
+int percpu_counter_init_irq(struct percpu_counter *fbc, s64 amount);
+void percpu_counter_destroy(struct percpu_counter *fbc);
+void percpu_counter_set(struct percpu_counter *fbc, s64 amount);
+void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch);
+s64 __percpu_counter_sum(struct percpu_counter *fbc);
+
+static inline void percpu_counter_add(struct percpu_counter *fbc, s64 amount)
 {
-	spin_lock_init(&fbc->lock);
-	fbc->count = amount;
-	fbc->counters = alloc_percpu(s32);
+	__percpu_counter_add(fbc, amount, FBC_BATCH);
 }
 
-static inline void percpu_counter_destroy(struct percpu_counter *fbc)
+static inline s64 percpu_counter_sum_positive(struct percpu_counter *fbc)
 {
-	free_percpu(fbc->counters);
+	s64 ret = __percpu_counter_sum(fbc);
+	return ret < 0 ? 0 : ret;
 }
 
-void percpu_counter_mod(struct percpu_counter *fbc, s32 amount);
-s64 percpu_counter_sum(struct percpu_counter *fbc);
+static inline s64 percpu_counter_sum(struct percpu_counter *fbc)
+{
+	return __percpu_counter_sum(fbc);
+}
 
 static inline s64 percpu_counter_read(struct percpu_counter *fbc)
 {
@@ -67,17 +79,28 @@ struct percpu_counter {
 	s64 count;
 };
 
-static inline void percpu_counter_init(struct percpu_counter *fbc, s64 amount)
+static inline int percpu_counter_init(struct percpu_counter *fbc, s64 amount)
 {
 	fbc->count = amount;
+	return 0;
 }
 
+#define percpu_counter_init_irq percpu_counter_init
+
 static inline void percpu_counter_destroy(struct percpu_counter *fbc)
 {
 }
 
+static inline void percpu_counter_set(struct percpu_counter *fbc, s64 amount)
+{
+	fbc->count = amount;
+}
+
+#define __percpu_counter_add(fbc, amount, batch) \
+	percpu_counter_add(fbc, amount)
+
 static inline void
-percpu_counter_mod(struct percpu_counter *fbc, s32 amount)
+percpu_counter_add(struct percpu_counter *fbc, s64 amount)
 {
 	preempt_disable();
 	fbc->count += amount;
@@ -94,21 +117,31 @@ static inline s64 percpu_counter_read_positive(struct percpu_counter *fbc)
 	return fbc->count;
 }
 
-static inline s64 percpu_counter_sum(struct percpu_counter *fbc)
+static inline s64 percpu_counter_sum_positive(struct percpu_counter *fbc)
 {
 	return percpu_counter_read_positive(fbc);
 }
 
+static inline s64 percpu_counter_sum(struct percpu_counter *fbc)
+{
+	return percpu_counter_read(fbc);
+}
+
 #endif	/* CONFIG_SMP */
 
 static inline void percpu_counter_inc(struct percpu_counter *fbc)
 {
-	percpu_counter_mod(fbc, 1);
+	percpu_counter_add(fbc, 1);
 }
 
 static inline void percpu_counter_dec(struct percpu_counter *fbc)
 {
-	percpu_counter_mod(fbc, -1);
+	percpu_counter_add(fbc, -1);
+}
+
+static inline void percpu_counter_sub(struct percpu_counter *fbc, s64 amount)
+{
+	percpu_counter_add(fbc, -amount);
 }
 
 #endif /* _LINUX_PERCPU_COUNTER_H */